<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="css/base.css">
    <link rel="stylesheet" href="css/normalize.css">
    <link rel="stylesheet" href="css/common.css">
    <script src="js/flexible.js"></script>
    <style>
        html,
        body {
            width: 100%;
            height: 100%;
        }

        .box {
            width: 10rem;
            height: 100%;
            background: -webkit-linear-gradient(top, #f00, #6f7cee)
        }
    </style>
</head>

<body>
    <div class="box">
        <h2>欢迎光临</h2>
    </div>
</body>

</html>